Carbureter



F. C. MOCK.

CARBURETER.

APPLICATION FILED MAR, 22. 1917.`

Patented May 4, 1920.

- li .I

, lmJen-zr .9i/ank C. TTZOCR y @MM ,UNITED STATES PATENT OFFICE.

'FRANK c. IvIocII, or CHICAGO, ILLINoIs, AssIGNoIt To s'rnoMBEn'G Moron Deviens COMPANY, or oIIIoAeo, ILLINOIS, n coRPoItA'IIoN or ILLINOIS.

CARBURE'IER.

Y To all whom it may concern:

, cerned particularly with improved means `for securing a proper combustible mixture upon idling or low speed operation. A frequent difiiculty with an ordinary carbureter is the deposit of liquid fuel upon the walls of the air passageways and the carbureting chamber, this being due to the fact that upon low speed and idling the 'suction below the usual throttle is very low,

sufficient however to draw the gasolene from the nozzle but insufficient to carry the gasolene on to the engine in vaporized state. It has been proposed heretofore to feed the llow speed or idling mixture above, that is l on the engine side of, the throttle.

My invention proceeds from that fundaf mental idea and contemplates an improved and simplified structure, together with improved means of control.

My invention will be clearly understood by reference to the accompanying drawing which illustrates a carbureter in vertical axial section.

In this drawifig, the casing 1 provides the mixing chamber 2 which'has the outlet 3 thereof controlled by the throttle 4 mounted upon the actuating shaft 5. The mixing chamber is provided with two inlets, one in the form of a Venturi tube or carbureting chamber 6 and the other in the form of an opening 7 controlled by the valve 8, the formerbeing the' primary air inlet and the latter being the secondary or auxiliary air inlet. Both air inlets lead from a primary air chamber 9 to which the outside air is. admitted under the control of the chokerl valve 10. I.

The fuel nozzle 11 is disposed axially in the Venturi tube, this nozzle vreceiving i Specification of Letters Patent.

`Application filed March 22,

y Patented May 4, 1920., 1917.` serial No. 156503.

lmechanism 14 is indicated as disposed within the constant level chamber for the usual purposes.

What I have described thus far is old in the art. The precise form of the carbureting instrumentalities is not important. My invention is applicable to either the s0 called plain tube type of carbureter or the auxiliary air valve type of carbureter. It is immaterial whether the two air inlets of an auxiliary air valve carbureter, such as shown in thev drawing, receive the air Independently from the outside or from a common air chamber such as the chamber 9. Incidentally, I have shown the auxiliary air valve 8 as carried with a piston 15 which, by way of the opening 16, is sub.- ject to the suction in the mixing chamber, the upper side of the piston being subject to atmospheric pressure, or substantially that, by way of the chamber 9 except when the choker 10. is closed.

Coming now to the feature of my inver; tion, it will be seen that the fuel nozzle 11 has its feeding outlet or outlets 17-17 in the; side thereof, these outlets being dis posed slightly above the most restrict@ l portion of the Venturi tube. A tube 18 er.:- tends` downwardly from the throttle into and through the nozzle 11, as shown, this tube being open to the outside air at the f' bottom, as indicated at 19. Within tir: nozzle 11 the tube 18 is provided with a small opening 20, this opening, like the openings 17-1? in the nozzle 11, being above the level of the li uid fuel in float chamber, indicated y the dot and dash line The annular space between the tube 18 and thenozzle 11 is such as to provide ample passageway for the liquid fuel and the tube' itself closes the top and bottom of the nozzle structure, as shown, although there may be an annular space between the top of the nozzle and the tube without harmful eifect.

The top of the tube 18 is hung upon the actuating shaft 5 upon which the throttle is mounted, it being understood that the shaft and the throttle may move relatively to the tube 18. The tube 18 passes through a suitable opening in the throttle 1, as illustrated, and` above the throttle when the throttle is closed,y an opening 21 is provided in the tube. I have constructed a carburcter' of titi this kind and secured the most desirable results by the use of a number seventy-four hole at 20 and a numbersixty hole at 21. In View of this relationship and in view of the fact that the 'bottom of the tube is open, there is assurance that the desirable feeding action, by way of the tube 18, takes place only upon idling and low speed. It is pref-l erable that in the air valve type of carbu-l a high instead of a low vacuum. The result is thorough volatilization, proper proportioning for low speed and idling, with the elimination 'of the possibility of the deosit of liquid fuel on the walls of lthe lfenturi tube and mixing chamber.

It will be obvious that at idle running or low* speed air will pass inwardly through the main fuel orifices 17-17 and will mix with the gasolene drawn up from the opening 13, the combined mixture being drawn into the tube 18 through ,the opening 20 when it will be mixed with further -air `drawn through opening 19.

It will be noted that the opening 21 is so arranged that after the throttle is opened slight y it begins to close and finally does close the opening so a-sto cut off the application of suction to the tube. As the throttle is opened with` a gradualincrease in suction in the Venturi tube, a vpoint is finally reached where the openings 17--17 begin to issue gasolene but at that time, it will be clear, the suction below the throttle is sufficient tovcarry the gasolene upward into the engine.

I claim as new and desire to secure by Letters Patent:

1.-v In al carbureter, a carbureting chamber .having an air inlet and a mixture outlet, a

throttle in said mixture outlet, a fuel nozzle feeding. into said air inlet, and-a tube open to the atmosphere at the bottom and extending through said nozzle and beyond said throttle, said tube being perforated above the normal fuel, level whereby it is fed from the interior of said nozzle.

2. In a carbureter, a carbureting chamber having an air inlet` and a mixture outlet, a throttle in said mixture outlet, a fuel nozzle feeding into said air inlet, and a tube extending through said nozzle and beyond said throttle, said tube being perforated above the nozzle outlet whereby it is fed from the interior of said nozzle and being open to the atmosphere at the bottom.

3. In a carbureter, a carbureting chamber having an air. inlet and a mixture outlet, a

throttle in said mixture outlet, a fuel nozzle feeding into said air inlet, and a tube extending through said nozzle and beyond said throttle, said tube being perforated whereby it is fed from the interior of said nozzle and having a feed outletat the top open when the throttle is substantially'closed and closed by the opening movement of the throttle.

4. In a carbureter, a carbureting chamber having an air inlet anda mixture outlet, a throttle in said mixture outlet, a fuel nozzle feeding into said air inlet', and a tube extendingv through said nozzle and beyond `said throttle, said tube being perforatedwhereby it is fed from the interior of said nozzle and having a feed outlet at the top open when the throttle is substantially closed-and closed by the throttle upon its opening movement.

In witness whereof, I hereunto subscribe myzname this 20th day of March, A` D.. 191

FRANK o. Moon. 

